(19)
(11) EP 0 852 323 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.12.1999 Bulletin 1999/50

(43) Date of publication A2:
08.07.1998 Bulletin 1998/28

(21) Application number: 98105378.8

(22) Date of filing: 27.04.1994
(51) International Patent Classification (IPC)6: F25B 31/00, F25B 43/02, C09K 5/04
// C10M171/00
(84) Designated Contracting States:
DE ES FR GB IT

(30) Priority: 27.04.1993 JP 101264/93
30.11.1993 JP 300220/93

(62) Application number of the earlier application in accordance with Art. 76 EPC:
94303024.7 / 0622445

(71) Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventors:
  • Hirahara, Takuho, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Kawaguchi, Susumu, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Shimizu, Tatsuaki, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Kawasaki, Katsuyuki, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Masuda, Noboru, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Ogasawara, Shinobu, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Konishi, Hiroshige, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Maruyama, Hitoshi, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Sumida, Yoshihiro, c/o Mitsubishi Denki K.K.
    Amagasaki-shi, Hyogo (JP)
  • Ueyama, Akemi, c/o Mitsubishi Denki K.K.
    8-chome, Amagasaki-shi, Hyogo (JP)
  • Toyama, Satoru, c/o Mitsubishi Denki K.K.
    8-chome, Amagasaki-shi, Hyogo (JP)
  • Suzuki, Sou, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)
  • Akahori, Yasushi, c/o Mitsubishi Denki K.K.
    Shizuoka-shi, Shizuoka (JP)

(74) Representative: Godwin, Edgar James 
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)

 
Remarks:
This application was filed on 25 03 - 1998 as a divisional application to the application mentioned under INID code 62.
 


(54) Refrigerant circulating system


(57) A compressor (1) draws in gaseous refrigerant optionally containing liquid refrigerant and discharges high-pressure gaseous refrigerant. A condenser (2) downstream of the compressor (1) condenses the high-pressure gaseous refrigerant. A throttle mechanism (3) downstream of the condenser (2) reduces the pressure of liquid refrigerant, optionally containing gaseous refrigerant, leaving the condenser (2). An evaporator (4) downstream of the throttle mechanism (3) vaporizes the liquid refrigerant or gas-liquid phase refrigerant leaving the throttle mechanism (3), the vaporized refrigerant constituting the gaseous refrigerant, optionally containing liquid refrigerant, which is drawn into the compressor (1). A refrigerating oil (6) is contained in the compressor (1) or a separate tank, at least part of the refrigerating oil being exposed to the refrigerant, for performing the function of lubrication or sealing. The refrigerant is based on fluoroamine, fluoroether, fluoropropane, fluoroethane, fluorosilane, or fluorosulfur. The refrigerating oil is lighter than the liquid refrigerant and dissolves only slightly in it. The temperature for separation into two layers, one being the refrigerant and the other being the refrigerating oil, is at least equal to the condensing temperature.






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